Internal Parasites. 233 
copies from figures given in my general treatise on 
entozoa. 
“Itisa fortunate circumstance that this destructive little 
tapeworm is comparatively rare in England. It is the 
smallest cestode infesting the dog, and the one most likely 
to be overlooked. 
“ Every year, notwithstanding its rarity, this little canine 
entozoon, by means of its larve, claims the lives of scores, 
or it may be hundreds of persons in this country ; but, with 
all England’s wealth, I do not suppose a dozen people could 
be found who would be prepared to sacrifice a few pounds 
each for the purpose of promoting an investigation, the re- 
sults of which would be eminently conducive to public 
health, and most certainly help to diminish our annual 
mortality. At the same time such a research would inevit- 
ably tend to lessen ‘the amount of, if it did not altogether 
put an end to, at least one frequent form of parasitism 
affecting our domesticated animals. 
“ Sportsmen who care for the welfare of their dogs should 
never allow these animals to devour the entrails of hares 
captured in the field. In the county of Norfolk I have 
myself witnessed this piece of carelessness on the part of 
keepers and have ventured to remonstrate accordingly. 
«“ Almost every hare (and the same may be said of full- 
grown rabbits) harbours within its abdominal cavity a larval 
parasite (Cysticercus pisiformis), which, when swallowed by 
the dog, becomes transformed into a tapeworm, varying 
from two to three feet in length (Zenza serrata.) In 
harriers and greyhounds the serrated tapeworm is very 
abundant ; but in other dogs it is comparatively rare. 
«“ Of the remaining internal parasites infesting the dog 
I need only allude to several species and varieties of pit- 
headed tapeworm (Bothriocephalus latus, B. cordatus, B. 
Suscus, B. reticulatus and B. dubius), since so far as I am 
aware only the first-named has been recognised as a canine 
entozoon in England. 
“TI must not omit to mention the arachnidan parasite 
